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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./concepts.html" class="navigation-link">Concepts</a> / <a href="./back-extensible-sequence.html" class="navigation-link">Back Extensible Sequence</a></td>
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<div class="section" id="back-extensible-sequence">
<h1><a class="toc-backref" href="./concepts.html#id1400">Back Extensible Sequence</a></h1>
<div class="section" id="id23">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>A <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a> is an <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> that supports amortized constant
time insertion and removal operations at the end.</p>
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<div class="section" id="id24">
<h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3>
<p><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a></p>
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<div class="section" id="id25">
<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
<p>In addition to the requirements defined in <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>,
for any <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p>
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<tr><th class="head">Expression</th>
<th class="head">Type</th>
<th class="head">Complexity</th>
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<tr><td><tt class="literal"><span class="pre"><a href="./push-back.html" class="identifier">push_back</a>&lt;s,x&gt;::type</span></tt></td>
<td><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a></td>
<td>Amortized constant time</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./pop-back.html" class="identifier">pop_back</a>&lt;s&gt;::type</span></tt></td>
<td><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a></td>
<td>Amortized constant time</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a>&lt;s&gt;::type</span></tt></td>
<td>Any type</td>
<td>Amortized constant time</td>
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<div class="section" id="id26">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>The semantics of an expression are defined only
where they differ from, or are not defined in <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</p>
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<tr><td><tt class="literal"><span class="pre"><a href="./push-back.html" class="identifier">push_back</a>&lt;s,x&gt;::type</span></tt></td>
<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,<a href="./end.html" class="identifier">end</a>&lt;s&gt;::type,x&gt;::type</span></tt>;
see <a class="reference internal" href="./push-back.html">push_back</a>.</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./pop-back.html" class="identifier">pop_back</a>&lt;v&gt;::type</span></tt></td>
<td>Equivalent to <tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,<a href="./end.html" class="identifier">end</a>&lt;s&gt;::type&gt;::type</span></tt>;
see <a class="reference internal" href="./pop-back.html">pop_back</a>.</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a>&lt;s&gt;::type</span></tt></td>
<td>The last element in the sequence; see <a class="reference internal" href="./back.html">back</a>.</td>
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<div class="section" id="id27">
<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
<ul class="simple">
<li><a class="reference internal" href="./vector.html">vector</a></li>
<li><a class="reference internal" href="./deque.html">deque</a></li>
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<div class="section" id="id28">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a>, <a class="reference internal" href="./push-back.html">push_back</a>, <a class="reference internal" href="./pop-back.html">pop_back</a>, <a class="reference internal" href="./back.html">back</a></p>
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